Authors: Roemer-Scheffer. --- Scheffer, F. --- Tornau, O.
Year: 1953 Publisher: Berlin, Hamburg : Paul Parey,

Authors: Fischer, Hermann --- Freckmann, W. --- Hager, G. --- Leiningen-Westerburg, W. Graf zu --- Mitscherlich, E. A. --- et al. Popp, M. --- Rippel, A. --- Tornau, O.
Year: 1931 Publisher: Berlin J. Springer